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Watch this video for a detailed description of dicot stems (2:19). This micrograph of a herbaceous dicot stem shows four basic parts (in order from outside to inside): epidermis, cortex, vascular bundle, and pith.
Watch this video for a detailed description of dicot stems (2:19). This micrograph of a herbaceous dicot stem shows four basic parts (in order from outside to inside): epidermis, cortex, vascular bundle, and pith.
Monocot stem is a circular-shaped hollow axial part of the plant which gives rise to nodes, internodes, leaves, branches, flowers with roots at the basal end. The size of stems varies in different species of monocots, but the size is barely ever as large as dicots.
An herbaceous dicot stem is very similar to the apical end of a woody dicot stem, where no secondary growth has taken place (figure 32-2b); the arrangement of tissues is the same. Figure 32-11 shows a cross section of an herbaceous dicot stem. Vascular bundles are arranged in a circle.
A herbaceous dicot stem has an epidermis, as does the stem of a monocot plant, but inside the stem are some differences. Just inside the epidermis is a layer of cells called the cortex.
The primary stem refers to the herbaceous (non-woody) stem, which has not undergone secondary growth (the growth that produces bark and wood). Some species (all monocots and some eudicots) remain herbaceous for their entire lives, maintaining the primary stem.
Plants have a vascular system which involves a network of vessels (vascular tissue) running through the leaves, stem and roots. These three parts are the main organs involved in transport. Tissue plan diagrams of a dicotyledonous leaf, stem and root.
Stems in Common Parlance . Shoot – Young, typically pliable stem. Twig – Slender woody stems growing from a branch or trunk. Branch – A woody stem growing from a trunk or bough. Branches are usually considered to be larger than twigs but smaller than boughs.
Plants that undergo only primary growth and have soft, green, non-woody stems are known as herbaceous plants. They typically have an annual, biennial, or perennial life cycle, meaning that they partially or completely die after a season and have to re-grow.
In this chapter, we describe in more detail the plant anatomy of flowering plants resulting from primary growth (growth derived from root or shoot apical meristems), and consider the developmental changes and consequently the patterns shown with age (distance from the apex).